Bonneville Backfires! - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 01-09-2004, 09:56 PM   #11
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The popping noise in the videos.... is that the backfire?

This maybe a dumb question... but what is... what causes a backfire?
I thought it was normally like an obscene bang coming from the exhaust... like a gunshot.

Does the noise happen at any speed/rpm or only at WOT or when you come down from WOT?
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Old 01-09-2004, 10:06 PM   #12
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Quote:
Originally Posted by Merlin 91/97
The popping noise in the videos.... is that the backfire?

This maybe a dumb question... but what is... what causes a backfire?
I thought it was normally like an obscene bang coming from the exhaust... like a gunshot.

Does the noise happen at any speed/rpm or only at WOT or when you come down from WOT?
if im not mistaken a backfire is caused when detonation occurs too late. causing part of the explosion to come out the exhaust(or somethin like that) ive seen flames shoot out the exhaust on certain backfire occasions(not on the Bonneville).
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Old 01-09-2004, 10:16 PM   #13
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Default Backfiring

Actually, backfiring usually occurs when unburned gasoline vapors ignites in the exhaust pipe. This is indicated by a loud bang. Sometimes a flame will come out the tail pipe.
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Old 01-09-2004, 10:49 PM   #14
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Default Re: Backfiring

Quote:
Originally Posted by stevej94
Actually, backfiring usually occurs when unburned gasoline vapors ignites in the exhaust pipe. This is indicated by a loud bang. Sometimes a flame will come out the tail pipe.
If a car is backfiring.... does it happen at random (at any rpm).... or only at (or after) WOT?
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Old 01-09-2004, 11:05 PM   #15
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Depends on what'* broken. A bad spring could make it occur more under load.
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